1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
5 *
6 * Development of this code funded by Astaro AG (http://www.astaro.com/)
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/netlink.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <net/netfilter/nf_tables.h>
16 #include <net/netfilter/nft_reject.h>
17 #include <linux/icmp.h>
18 #include <linux/icmpv6.h>
19
20 const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
21 [NFTA_REJECT_TYPE] = { .type = NLA_U32 },
22 [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
23 };
24 EXPORT_SYMBOL_GPL(nft_reject_policy);
25
nft_reject_validate(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nft_data ** data)26 int nft_reject_validate(const struct nft_ctx *ctx,
27 const struct nft_expr *expr,
28 const struct nft_data **data)
29 {
30 return nft_chain_validate_hooks(ctx->chain,
31 (1 << NF_INET_LOCAL_IN) |
32 (1 << NF_INET_FORWARD) |
33 (1 << NF_INET_LOCAL_OUT));
34 }
35 EXPORT_SYMBOL_GPL(nft_reject_validate);
36
nft_reject_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])37 int nft_reject_init(const struct nft_ctx *ctx,
38 const struct nft_expr *expr,
39 const struct nlattr * const tb[])
40 {
41 struct nft_reject *priv = nft_expr_priv(expr);
42
43 if (tb[NFTA_REJECT_TYPE] == NULL)
44 return -EINVAL;
45
46 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
47 switch (priv->type) {
48 case NFT_REJECT_ICMP_UNREACH:
49 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
50 return -EINVAL;
51 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
52 case NFT_REJECT_TCP_RST:
53 break;
54 default:
55 return -EINVAL;
56 }
57
58 return 0;
59 }
60 EXPORT_SYMBOL_GPL(nft_reject_init);
61
nft_reject_dump(struct sk_buff * skb,const struct nft_expr * expr)62 int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
63 {
64 const struct nft_reject *priv = nft_expr_priv(expr);
65
66 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
67 goto nla_put_failure;
68
69 switch (priv->type) {
70 case NFT_REJECT_ICMP_UNREACH:
71 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
72 goto nla_put_failure;
73 break;
74 default:
75 break;
76 }
77
78 return 0;
79
80 nla_put_failure:
81 return -1;
82 }
83 EXPORT_SYMBOL_GPL(nft_reject_dump);
84
85 static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
86 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
87 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
88 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
89 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
90 };
91
nft_reject_icmp_code(u8 code)92 int nft_reject_icmp_code(u8 code)
93 {
94 if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
95 return ICMP_NET_UNREACH;
96
97 return icmp_code_v4[code];
98 }
99
100 EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
101
102
103 static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
104 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
105 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
106 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
107 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
108 };
109
nft_reject_icmpv6_code(u8 code)110 int nft_reject_icmpv6_code(u8 code)
111 {
112 if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
113 return ICMPV6_NOROUTE;
114
115 return icmp_code_v6[code];
116 }
117
118 EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
119
120 MODULE_LICENSE("GPL");
121 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
122